In another week or so, I'll be ready to start skinning my teardrop. I'm wondering if the butyl tape under the trim is an absolute must, or if I could run a good, thick bead of caulk under there first and get the same type of protection. I ask simply because it seems like the caulk would be a lot easier to work with.

I used butyl tape to seal the roof patch on my standy. Then I used TremPro 635 polyurethane caulk around the outside to absolutely seal it. In actuality the tape is easier to work with because it doesn't smear and the like. Don't try to assemble the skin and trim then caulk. You need to apply caulk or tape before screwing down the trim.

I use butyl tape under the fan and the front side of the hurricane hinge. I do it under the fan because someday it'll need to be replaced. I use it under the hinge because it's much easier to set the hatch on and get it set with the tape.

I use a polyurethane sealant under the trim. I helped a friend replace the butyl tape under the trim on his motorhome. He had leaks. If he hadn't already purchased the stuff, I would have suggested a poly sealant.

greygoos wrote:I have always used butyl tape. Put it in the refrigerator the day before you install.

Just my inexperience talking, but how does putting it in the refrigerator help? does it make it so you can re-stick it if you screw up the first time?

"In the morning, the light is golden, in the midday 'tis time to nap, and in the evening the light returns. Into the night the stars shine brightly, now if only the moon would stay out of sight." - Some photographer